Hoisting device



Nov. 24, 1931. H. s. GEER 1,833,484

HOISTI'NG DEVICE Filed Sept. 26, 1930 3 Sheets-sheet 1 INVENTOR 5wATTORN Y NOV. 24, 1931. 3 GEER 1,833,484

HOISTING DEVICE Filed Sept. 26, 1930 3 Sheets-Sheet 2 INVENTOR f/aari6662'- M ATTORNEY H. S. GEER HOISTING DEVICE Nov. 24,- 1931.

2 1 3 Sheets-Sheet 3 Filed Sept.

m T N E V m ORNEY Patented Nov. 24, 1931 UNITED STATES PATENT OFFICEHOBART S. GEER, OF CORONA, NEW YORK, ASSIGNOR TO AMERICAN SAFETY DEVICECO., 015 NEW YORK, N. Y., A CORPORATION OF NEW YORK norsrme DEVICEApplication filed September 26, 1930. Serial No. 484,507.

This invention relates to hoisting devices, and more particularly toscaffold hoists such as are generally used for raising and loweringscaffolds in the course of erection of a building.

It is the primary object and purpose of the present invention to providesuch a hoisting device which is provided with reliable and positivelyoperating safety guard means which will effectively prevent the descentof the scaffold, and possible serious accident re sulting in injury ordeath, in the event that the workmen should lose control of thehoistingdevice during operation thereof.

It is one of the important features of my present improvements toprovide worm gearing for the operation of the rope or cable drum duringunwinding of the cable therefrom for the lowering of the scaffold and Imeans connected with the operating handle for the worm gearing andnormally locking said gearing and the drum against such rotation, whilepermitting of the rotation of the drum in the opposite direction to windthe rope or cable thereon.

. It is a further object of the invention to provide upon one end of thedrum spring pressed pivoted pawls cooperating with a ratchet connectedwith the worm gear whereby said drum and gear will rotate as a unit inan anti-clockwise direction to lower the scaffold, and holding devicesdetachably engage able with said pawls to hold the same out of contactwith the ratchetto permit of free rotation of the drum in the unreelingof the cable therefrom preparatory to rigging.

It is also another object of the invention to provide an operating leverfor rotating the drum in a clockwise direction to wind the cable thereonhaving a pawl cooperating with a ratchet on theother end of the drum andmeans for releasably locking. said pawl upon the lever in a disengagedposition for unreeling thee-able from the drum. There is also providedan additional safety pawl mounted on the machine frame and cooperatingwith said ratchet. I

It is a further general object of the invention toprovide a hoistingdevice of this character having the above noted improvements,

i an

characters designate corresponding parts which is relatively simple inits construction, light in weight and may be readily operated with aminimum of manual labor.

With the above and other objects in view, the invention consists in theimproved hoisting device, and in the form, construction and relativearrangement of the several parts as will be hereinafter more fullydescribed, illustrated in the accompanying drawings, and subsequentlyincorporated in the subjoined claims.

In the drawings, wherein I have disclosed one simple and practicalembodiment of my invention, and in which similar reference throughoutthe several views,

Figure l'is an end elevation of a hoisting machine embodying my presentimprovements;

Fig. 2 is a side elevation thereof;

Fig. 3 is a detail view showing the locking clutch for the worm gearingin its released position;

7 Fig. 4; is an elevation similar to Fig. 1 of the opposite end of themachine;

Fig. 5 is an enlarged vertical sectional view through the drum and wormgearing taken substantially on the line 5-5 of Fig. 6;

Fig. 6 is a section taken on the line 66 ofFig. 5, and

7 is a detail perspective view of one of the pawl holding clips.

Referring in detail to the drawings, 5 designates two spaced verticallydisposed end frame bars connected adjacent their upper and lower ends bythe tie rods 6 and 7 respectively. Below the rod 7, the frame bars aredivergently extended inwardly towards each otherand have theirextremities extended downwardly in parallel relation between which theupper ends of a scaffold supporting stirrup frame generally indicated at8 are rigidly fixed.

The drum 9 is rotatably supported between the frame bars 5 upon theshaft 10, one end or head of this drum being in the form of a ratchet11. Between said ratchet and the adjacent frame bar 5, the end of alever 12 is loosely mounted on the shaft 10 registering relation with asimilar aperture 18 in the lever 12 when the pawl '13 is moved againstthe action offspring 1 1 out of contact with the teeth of 'the ratchetThese registering apertures are adapted to receive a movable pin 19which maybe-conveniently attached to the lever 12 by means of a shortlength of'-c'hain"20r When un reeling the rope; or cable indicated; at-R 'efrom'the d 'mn' re arator to of the "scaffold, the pawl 13'may'thusbe ,l'oclred upon the lever-in an inoperative posit on.

The safety 'pa'wlshown at 21 hich is-"held' in engagement with the teethof ratchet 11 by the spring 22 must of course, also "be disenga edfrom'said ratchet, as well as the pawls which are associated with theworm gearing to be hereinafter referred to. In

order that the awl 21 be easily held in its-released positioml form thesame 'witli'an upwardly obliquely projecting hand piece shown 'at-23which may be easilyengaged'by the finger's'of theoperator grasping theframe bar 5 and pressed inwardly towards said frame bar.

, Above the pawl 21, a guide sheave 24: for the rope or cable R issuitably mounted up on the upper tie rod 6. p V f Between the oppositeend or head '25. the drum 9 and the other vertical bar 5 of the frame,the worm gear 26 is loosely mounted on the shaft 10. A ratchet '27'maybe integrally or otherwise connected with the gear 126 =.-and isdisposed closely adjacent to the drum head uponwhich, at diametricallyopposite sidesofsaid'ratchet, the pawls 28 are pivotally mounted 'tocoact with the teeth of the ratchetandthereby connect the worm gear withthe drum for rotation 'as a unit-in an anti-clockwise direction topermitunreeling of the rope or cable 'B'Of the drum; The pawls-28 are;held in engagement/with the ratchet27by suitableleaf springs 29 attachedatone 'of their ends to the flanged edges of the metalrs'trips 30secured to the faceof the drum head 25.' i V.

iBelowvthe worm gear 26, a horizontally disposed "ll-shaped bracketmember 31 is suitably fixed to the machine frame, andin the spaced armsof this bracket member, the opposite ends of the wor1n32 arejournalled,said "worm being engaged with the lower side oft-he worm gear 26.Theouter face of-one of the armsof the bracket 31 is formed with a bossiha-ving clutch teeth 33 with which a slidingwclutch member 34 on theextended end, of the worm shaft is normally held in engagement bymcansof the coil spring 36 surrounding said shaft between said clutchmember and the end of an operating handle 37 pivoted to the end ofitheshaft as at 38.

One end of a link 39 is pivotally connected with the clutch member 34and has its other end pivoted to the operating handle 37 below the pivot38 as indicated at 4L0, Thus, it will be understood that normally thehandle 37 isheld in the angular relation with respect ings, whiletheolutch meniber 34 being en gaged with the clutch teeth 33'0f thefixed bracket thereby locks the worm 32 against rotation, preventing ananti-clockwise rotation dfthe'gear 'a'can-d the drum 9 and theunreeline: of the rope or'cable fromthelatter, hen it is desired tounreel the cable, preparatory'torigging, thelocking pawls 28 are heldout ofengagement with the ratchet teeth 27 by means oftlie'metal clips41 shown in Figs. 6. and r7 ofthe-drawingsc After the pawl-s are pressedaway from the ratchet 28 against the actionof springs 29,-.one ofIthe angularends o'f .the clips. areengaged against the inner edgesofthe .pawlswliile theother angular ends of 'saidfclipsare'engaged over theflanges-of the metal strips 30. "Thus,

after securingpawl 13, in its released position by meansof'. the pinvl9on lever 12. and disengaging the: saftyipawl-i21 from, the ratchet 7 11,the rope or cable may be freely unwound from the drum. 1 c j I Havingabove fullydescribed the several mechanical parts ofthe-hoistingmachine, its

operation willlbe understood as follows:

In rota-ting'the drum in a clockwise direction with reference to Fig. 1of the drawings to. windfthe cablethereon, the lever 12 is verticallymanipulated, and in each down stroke of saidleven'thepawl 13 engagingone of the teeth of the ratchet 11, rotates said 7 dr m to wind thecable thereon, the pawls 28cat the opposite end of the drum moving idlyover'the teeth of the worm gear 26,'Which together with the orm'se arelocked against rotation byfthe clutch'1neans 33, 34; In the event ofbreakage of [any of the parts at the latter end of the drum, failuretorelease the pawls 28, or the accidental disengagement of the clutchmember 34from the teeth 33,-the descent of the. scafi'old'would belimited by contact of theleverv12 in its upward swinging movementwiththe upperend of the machine frame,-if the safety pawl21 should alsobe broken or accidentally released.

Thus, it

will be seen that my present improvements j the frame, in the event offailure ofiboth'of the first named safety devices, will',}t reventthedescentof the scaffold,

i the scaffold is tofbe ,lQwered, :,tl1e

, withrespect to ratchet 11, he grasps the crank arm of handle 37 andpulls the same laterally to the position seen in Fig. 3 of the drawings,thus moving clutch member 34 against the action of spring 36 out ofengagement with the clutch teeth 33. The scallold will then start todescend, the worm 52 being rotated through the connection of the lockingpawls 28 on the drum and the ratchet 27 carried by worm gear 26. Theoperator of course, retains a firm grasp upon the crank handle 37, andcontrols the rapidity of descent of the scaffold. Should the operatinghandle 37 for any reason he released while lowering the scaffold, thespring 36 will immediately act to again engage clutch member 34 with theteeth 33, and thus check the further descent of the scaf old.leretofore, contact of the worm operating handle with the end head thedrum has been relied upon to check the descent of the scaflold, but ithas sometimes happened that either the handle or the end plate of thedrum under the force of the im aact would break or the handle end wouldbe displaced to such an extent that it would pass outside of the drumhead. Several serious accidents have been due to this failure. By meansof my positive clutch lock for the worm gearing as above described, anypossibility of the continued rotation of the worm shaft after theoperating handle has been released, is preeluded.

It will be apparent from the foregoing that the numerous safety featuresof my improved scafl'olding hoistswill be very effective in reducing thepossibility of acci dents resulting in death or injury to the workmen toa minimum. \Vhile the various parts are of ruggeo and durableconstruction, the machine as a whole is comparatively light in weightand may be easily handled in the rigging of the scaffold, and operatedwith comparatively little manual exertion.

Also, it will be appreciated that my present improvements do not greatlycomplicate such devices as heretofore made and used, so thatmanufacturing costs thereof will not be materially increased.

While I have herein shown and lescribed a simple and practicalembodiment of the invention which has given very satisfactory results inactual use, it is nevertheless to be understood that the essentialfeatures thereof might also be embodied in various other alternativestructural forms. and I accordingly reserve the privilege of resortingto all such legitimate changes therein as may be fairly embodied withinthe spirit and scope of the invention as claimed.

tation includ n I claim:

1. In a hoisting machine, a frame, a cable drum revolubly mounted in theframe, means for operating the drum in one direction to wind the cablethereon, and means for controlling rotation of the drum in reversedirection to permit unrceling of the cable, said means including aloosely mounted gear, pawl and ratchet means connecting said gear withthe drum for unitary rotation therewith in the latter direction, a drivegear in constant mesh with the first named gear, means connected withthe drive gear to manually actuate the latter, and means for positivelylocking the drive gear against rotation including a part operativelyconnected to said actuating means and movable thereby to its releasedposition.

2. In a hoisting machine, a frame, a cable drum revolubly mounted in theframe, means for operating the drum in one direction to wind the cablethereon, and means for controlling rotation of the drum in reversediwith the drum for unitary rotation there with in the latter direction,a drive gear in constant mesh with the first named gear, an operatinghandle for the drive gear pivotally connected therewith, and clutchmeans for positively locking said drive gear against rotation includinga spring pressed clutch member and connecting means between the same andsaid operating handle whereby said clutch member is movable to 21released position by an initial. pivotal movement of said handle.

3. In a hoisting machine, a frame, a cable drum revolubly mounted in theframe, means for operating the drum in one direction to wind the cablethereon, and means for controlling rotation of the drum in reversedirection to permit unreeling of the cable, said means including aloosely mounted gear, pawl and ratchet means connecting said gear withthe drum for unitary rotation therewith in the latter direction, a drivegear in constant mesh with the first named gear, an operating handle forthe drive gear pivotally connected therewith, and clutch means forpositively locking said drive gear against r0- m a spring pressed clutchmember, and'a linl: pivotally connected to said clutch member and tosaid operating handle to wind the cable thereon, means for releasablylocking said pawl upon the lever in an "inoperative "position, meansmounted at the opposite endof thedrum for rotatingthe same in a reversedirection to unreel the cable therefrom, said means includingan'operating handle, and means automatically effective upon'the releaseof said handle to posltlvely lock said last named means againstrotation. In aho1st1ng machine, a frame, a cable' drum revolubly mountedin the frame and having a r'atchethead atone end thereof, a

vertically swinging lever, a spring pr essed "pawl carried by the levercooperating with the ratchet to rotate the drum in a direction to windthe cable thereon, a member carried by'said lever releasably engageablewith a part ofthe pawl and with said lever to lock the pawl in aninoperative position, means mounted at the opposite end ofthe drum forrotating the same 1n a reverse dlrec-tlon to unr'e'el the cabletherefrom, said means including an operating handle, and meansautomatically effective upon the release of said handle to positivelvlock said last named means against rotation. r

6. In a hoisting 'machine, a frame, a cable drum revolubly mounted in"the frame and having a ratchet head at one end thereof, a verticallyswinging lever, a spring pressed pawl carried by the lever cooperatingwith to wind the cable thereon, means for releasably'lockingsaid pawlupon the lever in an inoperative position, "a safety pawl pivoted ontheframe spring pressed into engagement with said ratchet head andhaving a hand piece obliquely projecting upwardly from its pivoted endfor movement of said pawl to a disengaged position, means mounted at theopposite end of the "drum for rotating the same in'a reverse directionto'unr'eel the cable therefrom, said means including an operatmg handle,and means automatlcally effective upon the release of said handle topositively look said last named means against rotation.

7. Ina scaffolding machine, a frame, a cable drum revolubly mountedtherein, manuallyoperable means for rotating the drum in onedirection towind the cable thereon, and means for rotating the drum in the oppositedirection to permit unwinding. of the cable, said means lncludlng alooselymountnsasgaaa pawls and with parts fixed to the drum to hold saidpawls out of engagement with the ratchet and permit'ofr'otation of thedrum to unreel the cable independently j of said m gearln-g.

In testimony that I claim the foregoing as my invention, have signed myname hereto.

HOBAR s. GEER.

theratchet to rotate the drum ina direction means between the clutchmember and the crankliandleto move said clutch member to released.position upon an initial pivotal movement of the crank handle, andmembers adapted to be detachably engaged with said

